US Vice-President Joe Biden shakes hands as he walks in the Allegheny County Labor Day Parade in Pittsburgh, Pennsylvania, on Monday. Biden gave a glimpse of what a Biden race for the Democratic presidential nomination would look like should he decide to make a late entry after a highly public period of soul-searching. In a speech and walkabout at a rally in downtown Pittsburgh, Biden marked Labor Day with a full-throated appeal for steps to fix income inequality and gave a picture of the personal touch he would offer on the campaign trail. Aaron Josefczyk / Reuters